If you don't have this card, forget about building a dragon deck. Pairs very well with Novalis (see below) to provide you with the only burst you have. A couple may be needed for certain battles. She is also sometimes used as leader when you use Nidhogg (because your RCR would've gone down the drain).

One of the most important cards. As long as you can take a hit from the enemy, dying is difficult. Can be paired with another Faugn ally, Dagon ally or even Daji ally. With this leader, Novalis gets a passive ATK boost while you can free up a slot as you don't need Evil Gargoyle to get you dark runes in a pinch. Also useful to take out high DEF mobs.

Sometimes, you gotta need HP. When you need HP, 200 RCR ain't gonna heal you back enough. That's when you use this guy. Also have a passive ATK boost with Ursula. Can be used as a sub in Faugn decks too to generate hearts.

For some stages, you'll have to take a lot of damage and save your bursts for another wave. That's when Nidhogg comes in handy. He doubles your HP and still give you triple ATK. However, with 2× HP, Faugn's +200 RCR won't do much so you've gotta bring the old golem out of the trash can if you're using Nidhogg.

Use as leader in replacement of Dagon only if you don't have him. You'll lose out on the passive ATK boost. However, as a sub, he works really well. He generates hearts that can be used for survival or for bursting in a Faugn deck.

One of the most common decks. It has a good balance of stats. Capable of two turns of burst, with Chernabog's ATK boost on top of Ursula's active. Most cards receive an additional 1.3× ATK too. As long as you can take a hit, you won't die.Undead DragonsHP: 48176 | ATK: 23337+10266+19536 | RCR: 0 | TC: 55 (Lv 90)
Effects: 2× HP, 6× ATK, -4817 HP every turn and +12% of lost HP healed per heart rune
Passives: 1.6× ATK for Ursula and Dagon

Another very common deck. This is used when large amounts of damage have to be taken. Still pretty good, but you'll have to manage your dark runes well. Also suitable for TC-limit battles by switching all subs with 2* salamanders.Old School DragonsHP: 20211 | ATK: 13932+6582+18522 | RCR: 482 | TC: 50 (Lv 80)
Effects: 3× ATK, 6× if ≥6 connected on-color runes matched and 5% leech
Passives: N/A

One of the most common decks before PR EDs happened. Tougher but more fun to play. Multiple bursts available. You need to manage your dark runes well though.

One comment regarding the team suggestion for Lunar Sirius Nightmare. I used that team to clear a few times but found that it was difficult to stall in round 1/2. After those stages you just blast through everything .

I eventually settled on PR Faugn + Novalis, Ursula, Dark Golem, PR RGB ED + PR Dagon for farming because you can grind forever in round 1 until everyone is ready. After that, you just need to burst down rounds 8/9 but everything else is quite safe.

This guide can be reserved for compiled startegies for clearing SMs. Should mention about daji ally though， she conpletes dragon team，removing the weakness of low damage and help clear stages that may be impossible otherwise.

What makes dragon so strong is imo it can shift playstyle just by changing leader/ally. Since the thread seems to boast dragon teams i will just put down some average statistics